Road-grader blade



Oei. 14, 1930. J. Q. SHUNK 1,773,512

ROAD GRADER BLADE Filed Aug. 30, 1929 gwomtoz faim Q. 5mm@ Patented Oct. 1 4, 1

mllilillil STT PATEIVF'FFICE JOHN Q. SHUNK, OF BUCYRUS, OHIO ROAD-GRADER BLADE Application filed August 30, 1929. Serial No. 389,461.

My invention relates 'to a blade for road and the offset perniits the earth to slide along graders and the like, and one of the objects the face of the blade and mold board with is to provide a blade in which less metal can less resistance than if the blade was of the be used than heretofore, at the saine time thickness throughout its entire width.

5 increasing the efliciency of the blade. 1EWhen the blade is otherwise worn out, the

A further object is to provide a blade in upper or thinner section is of substantially the which the earth will slide along the blade original thickness, due to the pressure of the with less resistance than with the blades hereearth being relieved on account of the offset. tofore used. Grader blades have heretofore been made 1c With these and other objects in View iny of equal thickness throughout their entire 55 invention consists in certain novel and pecu- -width. lhey are discarded when about three liar features of construction and combination inches are worn from them, due to the fact of parts as will be hereinafter more fully dethat the upper half ofthe blade is bolted to scribed and particularly pointed out in the the incid board in order to support it.

,5 claims. Vihen the blade is worn up to the mold 60 Referring to the drawing for a inore coinboard, the rest of the blade is discarded. By plete disclosure of the invention: n having the blade thinner in the upper part, Fig. l is an elevation showing the grader a less anionnt of metal is discarded for the blade in relation to the niold board. Sar-,ie effective scraping surface of the blade.

zo F ig. 2 is a vertical section of the grader Furthermore, the strength of the upper half G5 blade. is greater than in a blade of uniform thick- The blade l, made of rolled steel, is bolted ness equal to the thickness of the thinner to the inold board 2 by ineens of bolts 3. rlhe portion. rlhe wearing surface, or lower half, mold board is supported from the frame 4l of a blade of a certain thickness can there- 25 of the grader in the customary way, the brace fore be produc-ed at less cost than where the 5 being connected at its upper end to the trarne blade is of uniform thickness. 4 and at its lower end to a bracket 7 secured ltleletofore,l the cutting edge of grader to the back of the mold board. blades has been inade pointed and with a The grader blade in its upper half 8 is sharp bevel which wears away very quickly. so thinner than in its lower half 9. Grader By making the edge 13, in the beginning, blades are ordinarily about six inches high the Sallie anglethat it will ultimately Wear and of uniform thickness, running from about t0, the life of the blade is longer than heretoone-half to three quarters of an inch. l inake OI'G- iny blade about one-eighth of an inch thinner Y l Claim: in the upper portion than in the lower porl. A grader blade made of a single plate s0 tion. of metal, and having an upper portion adapt- -he niold boar-d is provided with an offed to be secured to a mold board, and a lower set l0, and into this offset fits the upper thin pOltiOIl that acts as a Scraper, and an offset portionof the blade. The counter sunk hole on the front face of the blade between the lo 1l lits the head of the bolt 3. said portions so Athat the upper portion is s;

In operation, the loose earth l2 does not thinner than the lower portion. pile up in front of the blade, but has a rolling 2. A grader blade made of a single plate motion. By having an offset on the face of of metal, and having an upper portion adaptthe blade, as the dirt is scooped up, after ed to be secured to a inold board, and a lower being raised a certain distance, it is loosened, portion that acts as a scraper, and an offset 90 on the Jfront face of the blade between the said portions so that the upper portion is thinner than the lower portion, the upper and lower portions being of substantially the same height.

3. A grader blade made of a single plate of metal comprising a lower portion having a flat wearing surface adapted to rest when in use upon the road surface, with a cutting edge at the front of the wearing surface, an upwardly extending plate portion having an oset on its front face that permits the earth to slide along the said face with less resistance above than below the offset.

In testimony whereo'll I alli); my signature.

JOHN Q. SHUNK. 

